Has any one heard of a flywheel mod for the pro? . Some ones selling a pro on Ebay, and in the listing he says,

I think they mean flywheel weights , but if it is on ebay it could mean anything !!!!

The 'mod' is to add an additional flywheel weight.

The theory goes that it slows down how quickly the engine picks up speed at the bottom end but when you rev it out it will tend to get away from you as the engine takes longer to slow down as it has more rotating inertia.

I think Haven do the flywheel kits.